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Hydrolysis is a reaction in which a water
molecule or hydroxide ion substitutes for another atom or group of atoms
present in a chemical resulting in a structural change of that chemical.
Potentially hydrolyzable groups include alkyl halides, amides,
carbamates, carboxylic acid esters and lactones, epoxides, phosphate
esters, and sulfonic acid esters. The lack of a suitable leaving group
renders compounds resistant to hydrolysis.
The chemical constituents that comprise
hydrocarbons, C11-C12, isoalkanes, <2% aromatics, consist entirely of
carbon and hydrogen and do not contain hydrolyzable groups. As such,
they have a very low potential to hydrolyze. Therefore, this degradative
process will not contribute to their removal from the environment.
Phototransformation in air:
tests for atmospheric oxidation half-lives are intended for single
substances and are not appropriate for this complex substance. However, this
endpoint is characterized using quantitative structure property
relationships for representative hydrocarbon structures that comprise
the hydrocarbon blocks used to assess the environmental risk of this
substance with the PETRORISK model (see library tab in PETRORISK
spreadsheet attached to Section 13).
Phototransformation in water and soil:
The direct photolysis of an organic molecule
occurs when it absorbs sufficient light energy to result in a structural
transformation. The absorption of light in the ultra violet (UV)-visible
range, 110-750 nm, can result in the electronic excitation of an organic
molecule. The stratospheric ozone layer prevents UV light of less than
290 nm from reaching the earth's surface. Therefore, only light at
wavelengths between 290 and 750 nm can result in photochemical
transformations in the environment.
A conservative approach to estimating a
photochemical degradation rate is to assume that degradation will occur
in proportion to the amount of light wavelengths >290 nm absorbed by the
molecule. Hydrocarbons, C11-C12, isoalkanes, <2% aromatics, contains
hydrocarbon molecules that absorb UV light below 290 nm, a range of UV
light that does not reach the earth's surface. Therefore, this substance
does not have the potential to undergo photolysis in water and soil, and
this fate process will not contribute to a measurable degradative loss
of this substance from the environment.
Hydrocarbons, C10-C12, isoalkanes, <2%
aromatics, biodegraded to an extent of 31% after 28 days and 41% after
41 days in a test of ready biodegradability. In a subsequent study that
used an acclimated inoculum, it biodegraded to an extent of 42% after 28
days and 48% after 41 days. This test substance can be considered
inherently biodegradable. These data are used as read-across data to
hydrocarbons, C11-C12, isoalkanes, <2% aromatics.
Hydrocarbons, C12-C14, isoalkanes, <2%
aromatics biodegraded to an extent of 11% after 28 days in seawater that
used the indigenous microorganisms in the seawater sample as a sole
source of the inoculum. These data are used as read-across data to
hydrocarbons, C11-C12, isoalkanes, <2% aromatics.
Adsorption / desorption:
Substance is a hydrocarbon UVCB. Standard
tests for this endpoint are intended for single substances and are not
appropriate for this complex substance. However, this endpoint is
characterized using quantitative structure property relationships for
representative hydrocarbon structures that comprise the hydrocarbon
blocks used to assess the environmental risk of this substance with the
PETRORISK model (see Product Library in PETRORISK spreadsheet attached
to Section 13).
The distribution of the substance in the
environmental compartments, air, water, soil, and sediment, has been
calculated using the PETRORISK Model, version 5.0. Computer modeling is
an accepted method for estimating the environmental distribution of
chemicals. Distribution modeling results are included in the 'Multimedia
distribution modeling results' tab in the PETRORISK spreadsheet attached
to Section 13 of the CSR.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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